The Duke of Edinburgh voluntarily gave up his driver's license on Saturday, Buckingham Palace said in a statement to several media outlets.

Philip's decision comes after he was involved in a car accident last month. Queen Elizabeth's 97-year-old husband was found lightly bleeding from the forehead after his SUV flipped near the queen’s country estate in Eastern England. The accident involved another car with two women, who were hospitalized, and a 9-month-old baby, who was found uninjured.

The windshield of the prince’s SUV shattered due to the force of impact.

Two days after the incident, Philip was photographed driving without a seat belt.

"After careful consideration The Duke of Edinburgh has taken the decision to voluntarily surrender his driving licence," the palace's statement said.

How old is too old to drive? There are more seniors behind the wheel than ever before and they have more accidents per mile than any other age group. But understandably, many older drivers are reluctant to give up the sense of independence that driving gives them.

Inside Edition found a group of seniors taking a refresher driving course run by AAA. It helps older drivers adjust for slower reflexes and weaker vision and get up to speed on new driving technology.

So how do you know when it's time for a loved one to hang up the keys?

"There are usually warning signs with senior drivers as to when they need to stop driving," AAA spokesman Robert Sinclair told Inside Edition. "They might have minor little fender benders, they scrape the house going in and out of the driveway, they might forget how to get to places they know very well. There might be some physical problems where they might not have the dexterity and the physical mobility they once had. When you see these things in singularity or in combination, that is the time."